It sounds like you're getting double tagging happening. I.e Management VLAN being tagged 911 and then a Native VLAN tagging of 911. Try to remove the management VLAN tagging or alternatively use a different Native VLAN.
If this doesn't work take a packet capture on the device connected to the MS to see what VLAN the DHCP discovers are coming from.
Eliot F | Simplifying IT with Cloud Solutions
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